tcp_var.h revision 1.98 1 /* $NetBSD: tcp_var.h,v 1.98 2003/06/23 11:02:16 martin Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
34 *
35 * NRL grants permission for redistribution and use in source and binary
36 * forms, with or without modification, of the software and documentation
37 * created at NRL provided that the following conditions are met:
38 *
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. All advertising materials mentioning features or use of this software
45 * must display the following acknowledgements:
46 * This product includes software developed by the University of
47 * California, Berkeley and its contributors.
48 * This product includes software developed at the Information
49 * Technology Division, US Naval Research Laboratory.
50 * 4. Neither the name of the NRL nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
55 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
56 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
57 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
58 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
59 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
60 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
61 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
62 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
63 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
64 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
65 *
66 * The views and conclusions contained in the software and documentation
67 * are those of the authors and should not be interpreted as representing
68 * official policies, either expressed or implied, of the US Naval
69 * Research Laboratory (NRL).
70 */
71
72 /*-
73 * Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc.
74 * All rights reserved.
75 *
76 * This code is derived from software contributed to The NetBSD Foundation
77 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
78 * NASA Ames Research Center.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the above copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * This product includes software developed by the NetBSD
91 * Foundation, Inc. and its contributors.
92 * 4. Neither the name of The NetBSD Foundation nor the names of its
93 * contributors may be used to endorse or promote products derived
94 * from this software without specific prior written permission.
95 *
96 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
97 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
98 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
99 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
100 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
101 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
102 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
103 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
104 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
105 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
106 * POSSIBILITY OF SUCH DAMAGE.
107 */
108
109 /*
110 * Copyright (c) 1982, 1986, 1993, 1994, 1995
111 * The Regents of the University of California. All rights reserved.
112 *
113 * Redistribution and use in source and binary forms, with or without
114 * modification, are permitted provided that the following conditions
115 * are met:
116 * 1. Redistributions of source code must retain the above copyright
117 * notice, this list of conditions and the following disclaimer.
118 * 2. Redistributions in binary form must reproduce the above copyright
119 * notice, this list of conditions and the following disclaimer in the
120 * documentation and/or other materials provided with the distribution.
121 * 3. All advertising materials mentioning features or use of this software
122 * must display the following acknowledgement:
123 * This product includes software developed by the University of
124 * California, Berkeley and its contributors.
125 * 4. Neither the name of the University nor the names of its contributors
126 * may be used to endorse or promote products derived from this software
127 * without specific prior written permission.
128 *
129 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
130 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
131 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
132 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
133 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
134 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
135 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
136 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
137 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
138 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
139 * SUCH DAMAGE.
140 *
141 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
142 */
143
144 #ifndef _NETINET_TCP_VAR_H_
145 #define _NETINET_TCP_VAR_H_
146
147 #if defined(_KERNEL_OPT)
148 #include "opt_inet.h"
149 #include "opt_mbuftrace.h"
150 #endif
151
152 /*
153 * Kernel variables for tcp.
154 */
155
156 #include <sys/callout.h>
157
158 /*
159 * Tcp control block, one per tcp; fields:
160 */
161 struct tcpcb {
162 int t_family; /* address family on the wire */
163 struct ipqehead segq; /* sequencing queue */
164 struct callout t_timer[TCPT_NTIMERS];/* tcp timers */
165 short t_state; /* state of this connection */
166 short t_rxtshift; /* log(2) of rexmt exp. backoff */
167 uint32_t t_rxtcur; /* current retransmit value */
168 short t_dupacks; /* consecutive dup acks recd */
169 u_short t_peermss; /* peer's maximum segment size */
170 u_short t_ourmss; /* our's maximum segment size */
171 u_short t_segsz; /* current segment size in use */
172 char t_force; /* 1 if forcing out a byte */
173 u_int t_flags;
174 #define TF_ACKNOW 0x0001 /* ack peer immediately */
175 #define TF_DELACK 0x0002 /* ack, but try to delay it */
176 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
177 #define TF_NOOPT 0x0008 /* don't use tcp options */
178 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
179 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
180 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
181 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
182 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
183 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */
184 #define TF_WILL_SACK 0x0800 /* try to use SACK */
185 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */
186 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */
187 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */
188
189
190 struct mbuf *t_template; /* skeletal packet for transmit */
191 struct inpcb *t_inpcb; /* back pointer to internet pcb */
192 struct in6pcb *t_in6pcb; /* back pointer to internet pcb */
193 struct callout t_delack_ch; /* delayed ACK callout */
194 /*
195 * The following fields are used as in the protocol specification.
196 * See RFC783, Dec. 1981, page 21.
197 */
198 /* send sequence variables */
199 tcp_seq snd_una; /* send unacknowledged */
200 tcp_seq snd_nxt; /* send next */
201 tcp_seq snd_up; /* send urgent pointer */
202 tcp_seq snd_wl1; /* window update seg seq number */
203 tcp_seq snd_wl2; /* window update seg ack number */
204 tcp_seq iss; /* initial send sequence number */
205 u_long snd_wnd; /* send window */
206 tcp_seq snd_recover; /* for use in fast recovery */
207 /* receive sequence variables */
208 u_long rcv_wnd; /* receive window */
209 tcp_seq rcv_nxt; /* receive next */
210 tcp_seq rcv_up; /* receive urgent pointer */
211 tcp_seq irs; /* initial receive sequence number */
212 /*
213 * Additional variables for this implementation.
214 */
215 /* receive variables */
216 tcp_seq rcv_adv; /* advertised window */
217 /* retransmit variables */
218 tcp_seq snd_max; /* highest sequence number sent;
219 * used to recognize retransmits
220 */
221 /* congestion control (for slow start, source quench, retransmit after loss) */
222 u_long snd_cwnd; /* congestion-controlled window */
223 u_long snd_ssthresh; /* snd_cwnd size threshhold for
224 * for slow start exponential to
225 * linear switch
226 */
227 /*
228 * transmit timing stuff. See below for scale of srtt and rttvar.
229 * "Variance" is actually smoothed difference.
230 */
231 uint32_t t_rcvtime; /* time last segment received */
232 uint32_t t_rtttime; /* time we started measuring rtt */
233 tcp_seq t_rtseq; /* sequence number being timed */
234 int32_t t_srtt; /* smoothed round-trip time */
235 int32_t t_rttvar; /* variance in round-trip time */
236 uint32_t t_rttmin; /* minimum rtt allowed */
237 u_long max_sndwnd; /* largest window peer has offered */
238
239 /* out-of-band data */
240 char t_oobflags; /* have some */
241 char t_iobc; /* input character */
242 #define TCPOOB_HAVEDATA 0x01
243 #define TCPOOB_HADDATA 0x02
244 short t_softerror; /* possible error not yet reported */
245
246 /* RFC 1323 variables */
247 u_char snd_scale; /* window scaling for send window */
248 u_char rcv_scale; /* window scaling for recv window */
249 u_char request_r_scale; /* pending window scaling */
250 u_char requested_s_scale;
251 u_int32_t ts_recent; /* timestamp echo data */
252 u_int32_t ts_recent_age; /* when last updated */
253 u_int32_t ts_timebase; /* our timebase */
254 tcp_seq last_ack_sent;
255
256 /* SACK stuff */
257 struct ipqehead timeq; /* time sequenced queue (for SACK) */
258
259 /* path MTU discovery blackhole detection */
260 int t_mtudisc; /* perform mtudisc for this tcb */
261
262 /* pointer for syn cache entries*/
263 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
264 };
265
266 #ifdef _KERNEL
267 /*
268 * TCP reassembly queue locks.
269 */
270 static __inline int tcp_reass_lock_try __P((struct tcpcb *))
271 __attribute__((__unused__));
272 static __inline void tcp_reass_unlock __P((struct tcpcb *))
273 __attribute__((__unused__));
274
275 static __inline int
276 tcp_reass_lock_try(tp)
277 struct tcpcb *tp;
278 {
279 int s;
280
281 /*
282 * Use splvm() -- we're blocking things that would cause
283 * mbuf allocation.
284 */
285 s = splvm();
286 if (tp->t_flags & TF_REASSEMBLING) {
287 splx(s);
288 return (0);
289 }
290 tp->t_flags |= TF_REASSEMBLING;
291 splx(s);
292 return (1);
293 }
294
295 static __inline void
296 tcp_reass_unlock(tp)
297 struct tcpcb *tp;
298 {
299 int s;
300
301 s = splvm();
302 tp->t_flags &= ~TF_REASSEMBLING;
303 splx(s);
304 }
305
306 #ifdef DIAGNOSTIC
307 #define TCP_REASS_LOCK(tp) \
308 do { \
309 if (tcp_reass_lock_try(tp) == 0) { \
310 printf("%s:%d: tcpcb %p reass already locked\n", \
311 __FILE__, __LINE__, tp); \
312 panic("tcp_reass_lock"); \
313 } \
314 } while (/*CONSTCOND*/ 0)
315 #define TCP_REASS_LOCK_CHECK(tp) \
316 do { \
317 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \
318 printf("%s:%d: tcpcb %p reass lock not held\n", \
319 __FILE__, __LINE__, tp); \
320 panic("tcp reass lock check"); \
321 } \
322 } while (/*CONSTCOND*/ 0)
323 #else
324 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp))
325 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */
326 #endif
327
328 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp))
329 #endif /* _KERNEL */
330
331 /*
332 * Queue for delayed ACK processing.
333 */
334 #ifdef _KERNEL
335 extern int tcp_delack_ticks;
336 void tcp_delack(void *);
337
338 #define TCP_RESTART_DELACK(tp) \
339 callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \
340 tcp_delack, tp)
341
342 #define TCP_SET_DELACK(tp) \
343 do { \
344 if (((tp)->t_flags & TF_DELACK) == 0) { \
345 (tp)->t_flags |= TF_DELACK; \
346 TCP_RESTART_DELACK(tp); \
347 } \
348 } while (/*CONSTCOND*/0)
349
350 #define TCP_CLEAR_DELACK(tp) \
351 do { \
352 if ((tp)->t_flags & TF_DELACK) { \
353 (tp)->t_flags &= ~TF_DELACK; \
354 callout_stop(&(tp)->t_delack_ch); \
355 } \
356 } while (/*CONSTCOND*/0)
357 #endif /* _KERNEL */
358
359 /*
360 * Compute the current timestamp for a connection.
361 */
362 #define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase)
363
364 /*
365 * Handy way of passing around TCP option info.
366 */
367 struct tcp_opt_info {
368 int ts_present;
369 u_int32_t ts_val;
370 u_int32_t ts_ecr;
371 u_int16_t maxseg;
372 };
373
374 /*
375 * Data for the TCP compressed state engine.
376 */
377 union syn_cache_sa {
378 struct sockaddr sa;
379 struct sockaddr_in sin;
380 #if 1 /*def INET6*/
381 struct sockaddr_in6 sin6;
382 #endif
383 };
384
385 struct syn_cache {
386 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
387 struct callout sc_timer; /* rexmt timer */
388 union { /* cached route */
389 struct route route4;
390 #ifdef INET6
391 struct route_in6 route6;
392 #endif
393 } sc_route_u;
394 #define sc_route4 sc_route_u.route4
395 #ifdef INET6
396 #define sc_route6 sc_route_u.route6
397 #endif
398 long sc_win; /* advertised window */
399 int sc_bucketidx; /* our bucket index */
400 u_int32_t sc_hash;
401 u_int32_t sc_timestamp; /* timestamp from SYN */
402 u_int32_t sc_timebase; /* our local timebase */
403 union syn_cache_sa sc_src;
404 union syn_cache_sa sc_dst;
405 tcp_seq sc_irs;
406 tcp_seq sc_iss;
407 u_int sc_rxtcur; /* current rxt timeout */
408 u_int sc_rxttot; /* total time spend on queues */
409 u_short sc_rxtshift; /* for computing backoff */
410 u_short sc_flags;
411
412 #define SCF_UNREACH 0x0001 /* we've had an unreach error */
413 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
414
415 struct mbuf *sc_ipopts; /* IP options */
416 u_int16_t sc_peermaxseg;
417 u_int16_t sc_ourmaxseg;
418 u_int8_t sc_request_r_scale : 4,
419 sc_requested_s_scale : 4;
420
421 struct tcpcb *sc_tp; /* tcb for listening socket */
422 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
423 };
424
425 struct syn_cache_head {
426 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
427 u_short sch_length; /* # entries in bucket */
428 };
429
430 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
431 #ifdef INET6
432 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb)
433 #endif
434 #ifndef INET6
435 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
436 #else
437 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \
438 ? intotcpcb(sotoinpcb(so)) \
439 : in6totcpcb(sotoin6pcb(so)))
440 #endif
441
442 /*
443 * The smoothed round-trip time and estimated variance
444 * are stored as fixed point numbers scaled by the values below.
445 * For convenience, these scales are also used in smoothing the average
446 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
447 * With these scales, srtt has 3 bits to the right of the binary point,
448 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
449 * binary point, and is smoothed with an ALPHA of 0.75.
450 */
451 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
452 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
453
454 /*
455 * The initial retransmission should happen at rtt + 4 * rttvar.
456 * Because of the way we do the smoothing, srtt and rttvar
457 * will each average +1/2 tick of bias. When we compute
458 * the retransmit timer, we want 1/2 tick of rounding and
459 * 1 extra tick because of +-1/2 tick uncertainty in the
460 * firing of the timer. The bias will give us exactly the
461 * 1.5 tick we need. But, because the bias is
462 * statistical, we have to test that we don't drop below
463 * the minimum feasible timer (which is 2 ticks).
464 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT
465 * is the same as the multiplier for rttvar.
466 */
467 #define TCP_REXMTVAL(tp) \
468 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
469
470 /*
471 * Compute the initial window for slow start.
472 */
473 #define TCP_INITIAL_WINDOW(iw, segsz) \
474 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \
475 ((segsz) * (iw)))
476
477 /*
478 * TCP statistics.
479 * Many of these should be kept per connection,
480 * but that's inconvenient at the moment.
481 */
482 struct tcpstat {
483 u_quad_t tcps_connattempt; /* connections initiated */
484 u_quad_t tcps_accepts; /* connections accepted */
485 u_quad_t tcps_connects; /* connections established */
486 u_quad_t tcps_drops; /* connections dropped */
487 u_quad_t tcps_conndrops; /* embryonic connections dropped */
488 u_quad_t tcps_closed; /* conn. closed (includes drops) */
489 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */
490 u_quad_t tcps_rttupdated; /* times we succeeded */
491 u_quad_t tcps_delack; /* delayed acks sent */
492 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
493 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */
494 u_quad_t tcps_persisttimeo; /* persist timeouts */
495 u_quad_t tcps_keeptimeo; /* keepalive timeouts */
496 u_quad_t tcps_keepprobe; /* keepalive probes sent */
497 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */
498 u_quad_t tcps_persistdrops; /* connections dropped in persist */
499 u_quad_t tcps_connsdrained; /* connections drained due to memory
500 shortage */
501 u_quad_t tcps_pmtublackhole; /* PMTUD blackhole detected */
502
503 u_quad_t tcps_sndtotal; /* total packets sent */
504 u_quad_t tcps_sndpack; /* data packets sent */
505 u_quad_t tcps_sndbyte; /* data bytes sent */
506 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */
507 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */
508 u_quad_t tcps_sndacks; /* ack-only packets sent */
509 u_quad_t tcps_sndprobe; /* window probes sent */
510 u_quad_t tcps_sndurg; /* packets sent with URG only */
511 u_quad_t tcps_sndwinup; /* window update-only packets sent */
512 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
513
514 u_quad_t tcps_rcvtotal; /* total packets received */
515 u_quad_t tcps_rcvpack; /* packets received in sequence */
516 u_quad_t tcps_rcvbyte; /* bytes received in sequence */
517 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */
518 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */
519 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
520 u_quad_t tcps_rcvshort; /* packets received too short */
521 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */
522 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */
523 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */
524 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
525 u_quad_t tcps_rcvoopack; /* out-of-order packets received */
526 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */
527 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */
528 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
529 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */
530 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */
531 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */
532 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
533 u_quad_t tcps_rcvackpack; /* rcvd ack packets */
534 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
535 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */
536 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */
537 u_quad_t tcps_predack; /* times hdr predict ok for acks */
538 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */
539
540 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */
541 u_quad_t tcps_noport; /* no socket on port */
542 u_quad_t tcps_badsyn; /* received ack for which we have
543 no SYN in compressed state */
544
545 /* These statistics deal with the SYN cache. */
546 u_quad_t tcps_sc_added; /* # of entries added */
547 u_quad_t tcps_sc_completed; /* # of connections completed */
548 u_quad_t tcps_sc_timed_out; /* # of entries timed out */
549 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */
550 u_quad_t tcps_sc_reset; /* # dropped due to RST */
551 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
552 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
553 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */
554 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
555 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
556 u_quad_t tcps_sc_collisions; /* # of hash collisions */
557 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */
558
559 u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */
560 };
561
562 /*
563 * Names for TCP sysctl objects.
564 */
565 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */
566 #define TCPCTL_SENDSPACE 2 /* default send buffer */
567 #define TCPCTL_RECVSPACE 3 /* default recv buffer */
568 #define TCPCTL_MSSDFLT 4 /* default seg size */
569 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */
570 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */
571 #if 0 /*obsoleted*/
572 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */
573 #endif
574 #define TCPCTL_INIT_WIN 8 /* initial window */
575 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */
576 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */
577 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */
578 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */
579 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */
580 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */
581 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */
582 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */
583 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */
584 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */
585 #define TCPCTL_KEEPCNT 19 /* keepalive count */
586 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */
587 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */
588 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */
589 #if 0 /*obsoleted*/
590 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */
591 #endif
592 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */
593 #define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */
594 #define TCPCTL_INIT_WIN_LOCAL 26 /* initial window for local nets */
595 #define TCPCTL_IDENT 27 /* rfc 931 identd */
596 #define TCPCTL_MAXID 28
597
598 #define TCPCTL_NAMES { \
599 { 0, 0 }, \
600 { "rfc1323", CTLTYPE_INT }, \
601 { "sendspace", CTLTYPE_INT }, \
602 { "recvspace", CTLTYPE_INT }, \
603 { "mssdflt", CTLTYPE_INT }, \
604 { "syn_cache_limit", CTLTYPE_INT }, \
605 { "syn_bucket_limit", CTLTYPE_INT }, \
606 { 0, 0 },\
607 { "init_win", CTLTYPE_INT }, \
608 { "mss_ifmtu", CTLTYPE_INT }, \
609 { "sack", CTLTYPE_INT }, \
610 { "win_scale", CTLTYPE_INT }, \
611 { "timestamps", CTLTYPE_INT }, \
612 { "compat_42", CTLTYPE_INT }, \
613 { "cwm", CTLTYPE_INT }, \
614 { "cwm_burstsize", CTLTYPE_INT }, \
615 { "ack_on_push", CTLTYPE_INT }, \
616 { "keepidle", CTLTYPE_INT }, \
617 { "keepintvl", CTLTYPE_INT }, \
618 { "keepcnt", CTLTYPE_INT }, \
619 { "slowhz", CTLTYPE_INT }, \
620 { "newreno", CTLTYPE_INT }, \
621 { "log_refused",CTLTYPE_INT }, \
622 { 0, 0 }, \
623 { "rstppslimit", CTLTYPE_INT }, \
624 { "delack_ticks", CTLTYPE_INT }, \
625 { "init_win_local", CTLTYPE_INT }, \
626 { "ident", CTLTYPE_STRUCT }, \
627 }
628
629 struct sysctl_tcp_ident_args {
630 struct in_addr raddr;
631 u_int rport;
632 struct in_addr laddr;
633 u_int lport;
634 };
635
636 #ifdef _KERNEL
637 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
638 #ifdef INET6
639 extern struct in6pcb tcb6;
640 #endif
641 extern struct tcpstat tcpstat; /* tcp statistics */
642 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
643 extern int tcp_do_rfc1323; /* enabled/disabled? */
644 extern int tcp_do_sack; /* SACK enabled/disabled? */
645 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */
646 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */
647 extern int tcp_do_newreno; /* Use the New Reno algorithms */
648 extern int tcp_mssdflt; /* default seg size */
649 extern int tcp_init_win; /* initial window */
650 extern int tcp_init_win_local; /* initial window for local nets */
651 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */
652 extern int tcp_compat_42; /* work around ancient broken TCP peers */
653 extern int tcp_cwm; /* enable Congestion Window Monitoring */
654 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */
655 extern int tcp_ack_on_push; /* ACK immediately on PUSH */
656 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
657 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
658 extern int tcp_log_refused; /* log refused connections */
659
660 extern int tcp_rst_ppslim;
661
662 extern int tcp_syn_cache_size;
663 extern struct syn_cache_head tcp_syn_cache[];
664 extern u_long syn_cache_count;
665
666 #ifdef MBUFTRACE
667 extern struct mowner tcp_rx_mowner;
668 extern struct mowner tcp_tx_mowner;
669 extern struct mowner tcp_mowner;
670 #endif
671
672 #define TCPCTL_VARIABLES { \
673 { 0 }, \
674 { 1, 0, &tcp_do_rfc1323 }, \
675 { 1, 0, &tcp_sendspace }, \
676 { 1, 0, &tcp_recvspace }, \
677 { 1, 0, &tcp_mssdflt }, \
678 { 1, 0, &tcp_syn_cache_limit }, \
679 { 1, 0, &tcp_syn_bucket_limit }, \
680 { 0 }, \
681 { 1, 0, &tcp_init_win }, \
682 { 1, 0, &tcp_mss_ifmtu }, \
683 { 1, 0, &tcp_do_sack }, \
684 { 1, 0, &tcp_do_win_scale }, \
685 { 1, 0, &tcp_do_timestamps }, \
686 { 1, 0, &tcp_compat_42 }, \
687 { 1, 0, &tcp_cwm }, \
688 { 1, 0, &tcp_cwm_burstsize }, \
689 { 1, 0, &tcp_ack_on_push }, \
690 { 1, 0, &tcp_keepidle }, \
691 { 1, 0, &tcp_keepintvl }, \
692 { 1, 0, &tcp_keepcnt }, \
693 { 1, 1, 0, PR_SLOWHZ }, \
694 { 1, 0, &tcp_do_newreno }, \
695 { 1, 0, &tcp_log_refused }, \
696 { 0 }, \
697 { 1, 0, &tcp_rst_ppslim }, \
698 { 1, 0, &tcp_delack_ticks }, \
699 { 1, 0, &tcp_init_win_local }, \
700 }
701
702 #ifdef __NO_STRICT_ALIGNMENT
703 #define TCP_HDR_ALIGNED_P(th) 1
704 #else
705 #define TCP_HDR_ALIGNED_P(th) ((((vaddr_t) (th)) & 3) == 0)
706 #endif
707
708 int tcp_attach __P((struct socket *));
709 void tcp_canceltimers __P((struct tcpcb *));
710 struct tcpcb *
711 tcp_close __P((struct tcpcb *));
712 #ifdef INET6
713 void tcp6_ctlinput __P((int, struct sockaddr *, void *));
714 #endif
715 void *tcp_ctlinput __P((int, struct sockaddr *, void *));
716 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
717 struct tcpcb *
718 tcp_disconnect __P((struct tcpcb *));
719 struct tcpcb *
720 tcp_drop __P((struct tcpcb *, int));
721 void tcp_dooptions __P((struct tcpcb *,
722 u_char *, int, struct tcphdr *, struct tcp_opt_info *));
723 void tcp_drain __P((void));
724 #ifdef INET6
725 void tcp6_drain __P((void));
726 #endif
727 void tcp_established __P((struct tcpcb *));
728 void tcp_init __P((void));
729 #ifdef INET6
730 int tcp6_input __P((struct mbuf **, int *, int));
731 #endif
732 void tcp_input __P((struct mbuf *, ...));
733 u_long tcp_mss_to_advertise __P((const struct ifnet *, int));
734 void tcp_mss_from_peer __P((struct tcpcb *, int));
735 struct tcpcb *
736 tcp_newtcpcb __P((int, void *));
737 void tcp_notify __P((struct inpcb *, int));
738 #ifdef INET6
739 void tcp6_notify __P((struct in6pcb *, int));
740 #endif
741 u_int tcp_optlen __P((struct tcpcb *));
742 int tcp_output __P((struct tcpcb *));
743 void tcp_pulloutofband __P((struct socket *,
744 struct tcphdr *, struct mbuf *, int));
745 void tcp_quench __P((struct inpcb *, int));
746 #ifdef INET6
747 void tcp6_quench __P((struct in6pcb *, int));
748 #endif
749 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *));
750 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *,
751 struct tcphdr *, tcp_seq, tcp_seq, int));
752 void tcp_rmx_rtt __P((struct tcpcb *));
753 void tcp_setpersist __P((struct tcpcb *));
754 void tcp_slowtimo __P((void));
755 struct mbuf *
756 tcp_template __P((struct tcpcb *));
757 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int));
758 struct tcpcb *
759 tcp_usrclosed __P((struct tcpcb *));
760 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
761 int tcp_usrreq __P((struct socket *,
762 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
763 void tcp_xmit_timer __P((struct tcpcb *, uint32_t));
764 tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq));
765 tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t,
766 tcp_seq));
767
768 int syn_cache_add __P((struct sockaddr *, struct sockaddr *,
769 struct tcphdr *, unsigned int, struct socket *,
770 struct mbuf *, u_char *, int, struct tcp_opt_info *));
771 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *,
772 struct tcphdr *));
773 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *,
774 struct tcphdr *, unsigned int, unsigned int,
775 struct socket *so, struct mbuf *));
776 void syn_cache_init __P((void));
777 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *));
778 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *,
779 struct syn_cache_head **));
780 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *,
781 struct tcphdr *));
782 int syn_cache_respond __P((struct syn_cache *, struct mbuf *));
783 void syn_cache_timer __P((void *));
784 void syn_cache_cleanup __P((struct tcpcb *));
785
786 int tcp_newreno __P((struct tcpcb *, struct tcphdr *));
787 #endif
788
789 #endif /* _NETINET_TCP_VAR_H_ */
790